brighten

1 ENTRIES FOUND:
brighten /ˈbraɪtn̩/ verb
brightens; brightened; brightening
brighten
/ˈbraɪtn̩/
verb
brightens; brightened; brightening
Britannica Dictionary definition of BRIGHTEN
1 
[+ object] : to add more light to (something)
2 
a  [+ object] : to make (something) more colorful or cheerful
— often + up
b  [no object] : to become brighter or more cheerful